---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21217#article
headline: "21217: Phone number does not appear to be valid"
url: https://www.twilio.com/docs/api/errors/21217
inLanguage: en
dateModified: 2025-12-18T21:40:49.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21217: Phone number does not appear to be valid

Log Level: ERROR

## Description

You attempted to initiate an outbound phone call to an invalid phone number.\
Please check the phone number and try again.